extract

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extract

 [ek´strakt]
a concentrated preparation of a vegetable or animal drug.
allergenic extract an extract of allergenic components from a crude preparation of an allergen, such as weed, grass, or tree pollen, molds, house dust, or animal dander, used for diagnostic skin testing or for immunotherapy for allergy.
cell-free extract the solution obtained by rupturing cells and removing all particulate matter.

ex·tract

(eks-trakt'),
1. A concentrated preparation of a drug obtained by removing the active constituents of the drug with suitable solvents, evaporating all or nearly all of the solvent, and adjusting the residual mass or powder to the prescribed standard.
2. To remove part of a mixture with a solvent.
3. To perform extraction.
[L. ex-traho, pp. -tractus, to draw out]

extract

/ex·tract/ (eks´trakt) a concentrated preparation of a vegetable or animal drug.

extract

(ĭk-străkt′)
tr.v. ex·tracted, ex·tracting, ex·tracts
To draw or pull out, often with great force or effort: extract a wisdom tooth; used tweezers to extract the splinter.

ex·tract′a·ble, ex·tract′i·ble adj.
ex·trac′tor n.

extract

Etymology: L, ex, out, trahere, to draw
1 [ek′strakt] n, a substance, usually a biologically active ingredient, prepared by the use of solvents or evaporation to separate the substance from the original material.
2 a concentrated form of an herb that is derived when the crude herb is mixed with water, alcohol, or another solvent and distilled or evaporated. Extracts may be either fluid or solid.
3 [ikstrakt′] v, to remove a tooth from the oral cavity by means of elevators or forceps or both. extraction, n.

extract

noun A concentrate of a drug, cells or a supernatant.

verb To obtain a thing—often concentrated or distilled—from a source.

extract

noun A concentrate of a drug, cells, or a supernatant. See Adrenal extract, Cell-free extract, Fluid extract, Green extract, Plasmid extract verb Psychology Obtain.

ex·tract

1. (ek'strakt) A concentrated preparation of a drug obtained by removing the active constituents with suitable solvents, evaporating all or nearly all of the solvent, and adjusting the residual mass or powder to the prescribed standard.
2. (ek-strakt') To remove part of a mixture with a solvent.
3. To perform extraction.
[L. ex-traho, pp. -tractus, to draw out]

extract,

n liquid herbal concentrate obtained by processing crude herbs in alcohol, water, or other solvents.
extract, citrus seed,
n Latin name:
Citrus spp; part used: seeds; uses: antiseptic, antibacterial, antifungal, bowel flora conditions, antibacterial mouthwash; precautions: can cause dehydration (overuse). Also called
grapefruit seed extract and
GSE.
extract, fluid,
n in herbal medicine, a substance derived by mixing an herb with a solvent (usually a mixture of water and alcohol).
extract, grapefruit seed,
n Latin name:
Citrus paradisii; parts used: seeds, pulp; uses: disinfectant, diarrhea, flu, colds, gingivitis, dental plaques, candidiasis, ulcers, skin conditions; precautions: should be diluted, can cause skin irritation. Also called
GSE.
extract, grass pollen,
n a mixture of pollen extracts derived from rye (92%), timothy (5%), and corn (3%) plants; processed to remove any proteins that may trigger allergic reactions. Used to treat benign prostate inflammation and may also be useful in treating prostatitis, prostate cancer, and high cholesterol. Precautions for grass pollen extract include hyper-sensitivity or allergy.
extract, oyster,
n a dietary supplement made of oyster extract, taurine, ginseng, and zinc. Its use has been associated with the development of edema.
extract, thymus,
n a concentrate of bovine or porcine thymus gland. Used to treat asthma, food allergies, respiratory infections, thyroid deficiencies, and viral hepatitis. Precaution urged for patients taking immunosuppressant medications. Caution should be used with bovine glandular extracts because of virus or prior contamination. Also called
thymus gland, calf thymus extract, thymic extract, or
thymomodu-lin.
extracts, adrenal,
n.pl orally administered extracts of the adrenal gland used to enhance adrenal activity and aid the body's response to stress and fatigue.
extracts, liver,
n.pl orally administered extracts of liver tissue used to treat hepatic disease and enhance the functions of the liver, including the use of fat and tissue regeneration.
extracts, native,
n.pl in natural medicine, potent extracts that are concentrated by removing solvent under low pressure and temperature.
extracts, pancreatic,
n.pl orally administered extracts of the pancreas used to enhance the functions of the pancreas and to treat autoimmune diseases, cancer, cystic fibrosis, infections, and inflammatory diseases.
extracts, plant,
n.pl products, including absolutes, resinoids, concretes, hydrosols, pomades, and tinctures, that are derived from aromatic plant material by extraction processes such as distillation (steam or water), hydrodiffusion, expression, solvent extraction, carbon dioxide extraction, enfleurage or maceration.
extracts, spleen,
n.pl orally administered extracts of the spleen. Claimed to enhance the functions of the spleen, aid in white blood cell production, and treat infections and conditions connected to splenectomy.
extracts, standardized,
n herbal products in which a consistent level of the active chemical ingredient has been established.
extracts, thyroid,
n.pl preparations made from bovine and porcine thyroid glands available by prescription or over the counter; used to treat hypothyroidism.

ex·tract

(eks-trakt, ekstrakt)
1. To perform extraction.
2. A concentrated drug preparation obtained by removing active constituents of the drug with suitable solvents, evaporating all or nearly all solvent, and adjusting residual mass or powder to the prescribed standard.
[L. ex-traho, pp. -tractus, to draw out]

extract,

n a concentrate obtained by treating a crude material, such as plant or animal tissue, with a solvent, evaporating part or all of the solvent from the resulting solution, and standardizing the resulting product.

extract

a concentrated preparation of a vegetable or animal drug.

allergen extract
an extract usually containing protein of any substance (plant, food, insect, etc.) to which an animal may be allergic.
cell-free extract
the solution obtained by rupturing cells and removing all particulate matter.
crude extract
usually of cells when they are suspended in buffer and broken up and nothing is removed.
References in periodicals archive ?
There are several reasons why a child with a detectable level of allergen-specific IgE can have a negative SPT, including the use of poorquality allergen extracts for SPTs and the effects of environmental exposures, such as helminth infections, in reducing skin test reactivity (10, 18) or individual differences in antibody affinities (26).
Single lots of food allergen extracts from three different commercial sources were compared for their efficacy in evaluating immediate food hypersensitivity.
Offering classical and new techniques, they also cover a number of disciplines as they address the molecular mechanisms of allergy, culture of T-cells from peripheral blood, T-cell lines and human T-cell clones, human T-cell epitopes of allergens, restriction of T-cell responses, short-term culture of CD8 cells and intracellular cytokine staining, processing of certain T-regulatory cells, using monocyte-derives dentritic cells and antigen-presenters in T-cell proliferation and cytokine production, human cytokine responses, human chemokine production, standardization and characterization of allergen extracts, conjugation of haptens, monoclonal antibodies, air sample assays, hologene assays, microscopic identification of pollens, identification of mast cells, and in-situ hybridization.
The following allergen extracts were tested in the study population: Dermatophagoides pteronyssinus (DP), D.
Most of these antibodies also bound to the appropriate allergen extracts immobilized to paper discs (data not shown).
Alternative approaches aimed at increasing the safety of currently available allergen extracts include oral administration of encapsulated antigen for delayed absorption in the small intestine; this is being pursued by a Danish company.
In the first part of the study, subjects responded to a questionnaire, and had a skin-prick test to latex extract, seven other allergen extracts, with positive and negative skin-prick controls.
Moreover, allergen extracts prepared by different procedures and marketed by different companies vary considerably in composition and content of allergen materials; some may contain irritants and extraneous materials.
The six allergen extracts were dog, cat, two types of dust mites, short ragweed (Ambrosia artemisiifoiia).
SPTs with allergen extracts are the favoured method of in vivo testing for IgE-mediated sensitivity.
In cases of suspected allergy to indoor and outdoor aeroallergens, skin-prick testing was performed by standard procedures; prick lancets and allergen extracts were obtained from Allergo-pharma (17).
5,9) The use of nonstandardized allergen extracts leads to further difficulties.